5 Answers
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Depending on the server hardware, you can try a couple of things to find the config. Start with dmidecode piped into less to obtain the server make/model information (and potentially, the serial number). For Dell, dmidecode | grep -i serial should output the service tag. You can cross reference the initial build info from Dell's support site.

Armed with the drive model numbers, you can google to obtain the specifications. The last entry in the output clearly shows a virtual disk comprised of the two physical disks listed above. You can get the exact controller spec from lspci -v.

mdadm is not needed if you really have hardware raid, as the OS should only see one device for every raid array in the system.

One way to detect an hardware raid controller could be to scan your boot.msg log file for scsi devices that identify themselves as RAID controllers. I.e. I have a system with a 3ware controller and find the following lines in my kernel boot log:

If this is a virtual server of some form then no, there's no way you can know what's actually servicing your disk IO. If it's a physical server you may be able to install (or find if already installed) any disk controller tools/diags code that would be able to tell you what the disk layout is. There's certainly nothing in the 'df' you provided that would point one way or another. Ultimately it's a question best asked of them, if you get more details from them feel free to come back here and we'll see what we can do ok.

Try using lspci to determine if there is a hardware RAID controller. If there is a hardware controller the OS will not normally be able to see the RAID using the normal tools, however there are normally Linux based clients available for the big vendors (PECL/3com/etc).

Another useful tool to see lowlevel hardware is dmidecode. It can tell you a lot about the physical box your using.

mdadm is for Linux software RAID. Try probing the hardware with dmidecode to determine the hardware vendor for the RAID controller. From there, you will need to use the vendor specific utility to query the RAID controller for it's configuration.